Jig device for bending shell plating in ship building work

ABSTRACT

A JIG DEVICE FOR BENDING SHELL OR OUTSIDE PLATING SHIP BUILDING WORK, WHICH COMPRISES A CHANNEL SHAPED MAIN BAR, A PLURALITY OF CROSSHEAD MEMBERS SLIDABLE ALONG SAID CHANNEL SHAPED MAIN BAR, A PLURALITY OF CHANNEL SHAPED SLIDE BARS, EACH ADAPTED TO SLIDE LONGITUDINALLY AND ADAPTED TO BE OSCILLATED ACCORDING TO SLIDING MOVEMENT OF SAID COSSHEAD MEMBERS, AND A RESILIENT STRAP CONNECTED TO ONE END OF EACH OF SAID SLIDE BARS.

Nov. 2, 1971 ISABURO TAKEYASU JIG DEVICE FOR BENDING SHELL PLANTING IN SHIP BUILD iNG WORK Filed May 8. 1969 3 Sheets-Sheet 1 l il I l I 2 4/7/ g g I! k4 H H F F J L ISABURO TAKEYASU,

INVENTOR BY, M

ATTORNEY B 1971 ISABURO TAKEYASU 3,616,676

JIG DEVICE FOR BENDING SHELL PLANTING IN SHIP BUILDING WORK Filed may a. 1969 3 Sheets-Sheet 2 'FiSAA ISABURO TAKEYASU wmmfm M ATTORNEY NOW 1971 ISABURO TAKEYASU 6 JIG DEVICE FOR BENDING SHELL PLANTING IN SHIP BUILDING WORK Filed May a, 1969 5 Sheets-Sheet I ISABURO TAKEYASU,

INVEN TOR BY 101mb M'ZO QM ATTORNEY United States Patent Oflice 3,616,676 Patented Nov. 2., 1971 3,616,676 JIG DEVICE FOR BENDING SHELL PLATING IN SHIP BUILDING WORK Isaburo Takeyasu, -21 Nogami, 2-chome, Takarazuka, Hyogo Prefecture, Japan Filed May 8, 1969, Ser. No. 822,927 Int. Cl. B21d 37/04 US. Cl. 72-481 2 Claims ABSTRACT OF THE DISCLOSURE A jig device for bending shell or outside plating in ship building work, which comprises a channel shaped main bar, a plurality of crosshead members slidable along said channel shaped main bar, a plurality of channel shaped slide bars, each adapted to slide longitudinally and adapted to be oscillated according to sliding movement of said crosshead members, and a resilient strap connected to one end of each of said slide bars.

The principal object of the present invention is to provide a new and improved jig device for bending the shell plating in ship building work, which device can be readily manipulated and, wherein minute adjustment of the curvature of the resilient jig strap may be effected.

Other objects of the present invention will become apparent from the following detailed description taken in conjunction with the accompanying drawings wherein:

FIG. 1 is a front view of the jig device according to this invention;

FIG. 2 is a sectional view taken along line AA of FIG. 1;

FIG. 3 is a sectional view taken along line BB of FIG. 1;

FIGS. 4A, 4B, 4C and 4D are perspective views showing details; and

FIG. 5 is a diagrammatical view showing a manner of operation of the present jig device.

Referring to the drawing, 1 designates a main bar which is a channel having the free edges of its side portions bent inwardly forming guide rails 2. A plurality of square guide plates 4 engage with and are slidable along the channel 3 of the main bar 1. Each of said square guide plates 4 has a circular opening 5 therein, as shown clearly in FIG. 4D. As best shown in FIGS. 3 and 4C, a U-shaped crosshead member 7 having outwardly turned flanges 6 at the ends of the legs thereof extends through said circular opening 5 of each guide plate 4, with the body portion thereof extending between the bent edges 22 of the main channel bar 1.

A plurality of channel shaped slide bars 8 are provided, each of which also has the free edges of its side portions bent inwardly forming engaging rails 8'. Each slide bar 8 extends through a U-shaped crosshead member 7 between two legs of the U, thereby forming a crosshead connection with the main bar 1. In each of the channel shaped slide bars 8, there is provided a slide block in sliding engagement with the channel slot 9 thereof. Each slide block 10 has a central cavity 11 in the upper portion thereof as shown in FIG. 4B. Each slide block 10 is arranged in a crosshead member 7. At the top of the crosshead member 7, there is a threaded bolt 12 having a Wing nut shaped head 13 thereon. The inner end of said threaded bolt 12 is engaged in said cavity 11 in the slide block 10. The end of each slide bar 8 is connected to a resilient strap, for instance a steel strap 15, by means of an appropriate detachable fitting 13' having a thumb nut 14, at predetermined intervals along strap 15.

The manner of handling the device according to this invention is as follows: By actuating the wing nut shaped head 13 of the threaded bolt 12, the inner end of said bolt 12 will press the slide block 10 against the bottom of the channel of the slide bar 8 and, due to the reaction, the crosshead member 7 will be retracted relative to the slide block 10, so that the flanges 6 on the crosshead member 7 will press the guide seat plate 4 strongly against the inner face of the rail 2 of the main bar 1, whereby the main bar 1 and the slide bar 8 will be firmly held together. If the bolt 12 is unscrewed, the slide block 10 will be released and, at the same time, the crosshead member 7 will be released from the square guide seat 4, whereby the slide bar 8 will be released from the main bar 1. Furthermore, the crosshead member 7 can rotate within the circular opening 5 of the guide plate 4. Under the above mentioned condition, when the slide bar 8 is transversely pushed it will pivot around an axis formed by said bolt 12, the crosshead member 7 being slightly rotated in the circular opening 5 of the guide plate 4, so that the slide bar 8 may be tilted either leftwardly or rightwardly. The crosshead member 7 supporting the slide bar 8 is also guided by the guide plate 4 so that it can be moved along the channel slot 3 of the main bar 1, so that the distance between the adjacent slide bar 8 can be adjusted. By such manipulation of the slide bar 8, the curvature of the resilient strap 15 may be adjusted as desired, so that the resilient strap 15 may be employed as an adjustable jig for bending the outside plating of a ship.

From the foregoing it will be seen that according to the present invention, in contradistinction to the hitherto employed jig for determining the curvature of the outside plating, more minute adjustment of the curvature may be effected. In the device of this invention, the slide bar 8 is associated with the movable crosshead member 7, and the slide bar 8 is adapted to slide through the said crosshead member, the crosshead member 7 being slidable together with the square guide seat 4 along the channel slot 3 of the main bar 1, and the slide bar 8 being pivotable around the axis of the crosshead member 7, so that by virtue of the above mentioned dual operation the slide bar 8 may be tilted, whereby enabling to obtain more complicated curvature of the resilient strap 15 which is interchangeable.

What I claim is:

1. A jig device for bending shell plates in ship building work, comprising a channel shaped main bar having the free edges of its side portions bent inwardly, a plurality of guide plates in said channel shaped main bar slidable along said inwardly bent free edges, each guide plate having a circular hole therein, a plurality of U- shaped crosshead members, one for each guide plate, extending through the hole in the corresponding guide plate and having the free ends of said members bent outwardly to form flanges engaged with the guide plate, a bolt threaded through the base of the U-shaped crosshead member, a plurality of channel shaped slide bars, one extending through each U-shaped crosshead member and slidably engaged with the main bar, a plurality of slide blocks, one in each slide bar and slidably engaged with the base of the interior of the slide bar, the end of said bolt extending through the base of the crosshead member engaging the slide block and, when tightened down, holding the slide block tightly against the base of the slide bar and holding the flanges of the crosshead member tightly engaged with the guide plate and the guide plate tightly engaged with the inwardly bent free edges of the main bar, and a resilient strap detachably connected to the bottoms of said slide bars, whereby the slide bars can be moved up and down and along the 3 4 main bar and can be pivoted around said bolts as centers 2,518,867 8/ 1950 Clary 269266 when the bolts are loosened slightly. 1,303,596 5/ 1919 Rifilard 72-295 2. A jig device as claimed in claim 1 in which said 1,129,650 2/1915 Dean 72-305 slide blocks each have a cavity therein which the end of the bolt engages, 5 CHARLES W. LANHAM, Primary Examiner References Cited M. I. KEENAN, Assistant Examiner UNITED STATES PATENTS U.S. Cl. X.R.

2,517,308 8/1950 Harrs -1 287-49 72--293;269266;28749 2,463,966 3/1949 Hauschild 72 301 

